XtremeDime

iTrader: (16)

I see there several different size springs for the Tial BOV, anyone know which one to use?

veee8

iTrader: (40)

Depends how much vacuum at idle your cam pulls.

XtremeDime

iTrader: (16)

Stock cam, Im not sure how much.

TiAL

you need to know this

pwrtrip75

iTrader: (8)

what difference does it make? I just threw my BOV valve on the way i got it. What would it do w/ the wrong spring?

LS1Silverado05

iTrader: (41)

Umm not operate properly...

vipvegas

iTrader: (13)

definately not good could over boost..

pwrtrip75

iTrader: (8)

BOV has nothing to do with regulating boost to make it overboost.

barnat

iTrader: (59)

I always thought that some guys run a BOV as a safty feature just incase of a stuck wastegate or over boost condition so as not to damage the engine or blow a head gasket ???Thats why you can buy predetermined (higher springs) for them to change out, just above your current boost setting.Lets say your running 10PSI and wanted a safty in there for your build,youde put 12 PSi springs in there I know ive heard of guys doing this !

veee8

iTrader: (40)

The different springs are for different manifold VACUUM levels, not boost pressures. Boost holds the bov shut until it is removed, like when the throttle is lifted, then it pops off.
Maybe if you never attached the reference line to the top of the bov, but the springs are very light for fast response in a bov, nothing like a wastegate.

KILLER-LS1

iTrader: (18)

hey well my cam pulls around 12-15 in/hg im assuming i either need the 7 or 9 psi spring?

LS1x2

iTrader: (11)

They have a guide on their website. Just reference your vacuum. If you run a blower use the 3psi spring.

TiAL

-7 would be good for you

if you get a Q you would want the -8